求翻译：已不可撤销的保兑的即期信用证付款。信用证必须在装运前30天到达我方。按照惯例，信用证议付有效期为最后装运期后15天在中国到期是什么意思？

Irrevocable letter of credit confirmation. The credit must reach us 30 days prior to shipment. By convention, the letter of credit negotiation is valid for 15 days after the final shipment due in China

has been an irrevocable acceptance of the credit card payments. Credit must be shipped in 30 days before our arrival. In accordance with established practice, the credit is valid for the final payment 15 days after shipping period expired in China

Could not be abolished the immediate letter of credit payment which guarantees cashing.The letter of credit must 30 days arrive us before shipping.According to the convention, the letter of credit negotiation term of validity latter 15 days expired for the final time shipment in China

The irrevocable confirmed letter of credit payments. Credit must arrive 30 days prior to shipment. In accordance with established practice, negotiation letter of credit will be valid for 15 days after the last shipment due in China

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